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(N6 me@ T s fL, BETTES. RULING ATTACHMENT FO'R B'LAGKBOARDS'.

Patented Feb.: 1888.

g4/manto@ k2 is a side viewof the detent devices.

Y UNITED STATES PATENT OFFICE. v

SEPHOBA LOUISE BETTES, OF WASHINGTON, DISTRICT OF COLUMBIA.

RULING ATTACHMENT FOR BLACKBOARDS.

SPECIFICATION forming part of Letters Patent No. 377,663. dated February 7, 1888.

Application filed July 11, 1887.

To all whom it may concer-n: n

`Be it known that I, SEPHORA LOUISE BETTEs, of Washington, in the District of Oolumbia, have invented an Improved Ruling Attachment for Blackboards, 8vo., of which the following is a speciiication. V

In the accompanying drawings, Figure 1 is an elevation of my ruling attachment. Fig. Figs. 3, 4, and 5 are similar Views representing modified forms of detent devices.

My invention consists of a ruling attachment especially designed for use in connection with blackboards in schools, but which, as will be obvious, is equally applicable to drawing-boards, for use in ruling lines upon paper, and in other similar connections.

A ruler, A, is suspended, by tapesor bands B B', from a roller, C, provided at its ends with y 2o journals D D', to it in suitable sockets in brackets upon the blackboard-frame, the'wall to which the blackboard is applied, or the drawing-board. One of the journals D is free to rotate in the end of the roller, and has attached thereto, as indicated in dotted lines in Fig. 1, one end of a torsional spiral spring, H,

which at its other end is secured to the interior of the roller, the latter being recessed or hollowed for the reception of the spring. Journal D is .squared and iits a correspondingly-shapedsocket, so that when placed in the latter it will be held from rotation when the tapes are unwound from roller C in the depression of ruler A. Applied to the end of roller O is a detent-wheel, E, shown asaratchet-wheel in Figs. 1 and 2; and a pawl or dog, F, constituting a detent engaging with said wheel, is formed on or attached to a lever, G, pivoted on a bracket, N. (See Fig. 2.) The ratchet-wheel and pawl or dog of Figs. 1 and 2 may be replaced by any equivalent devicesas, for instance, by the wheelhaving V-shaped teeth and detent of corresponding shape, (shown in Fig. 3,) or by the friction-wheel and friction-block or brakeshoe of Fig. et. The detent carried by lever G is held in engagement with the Wheel E by a spring, L.

In my attachment the ruler is suspended in position such as to render it conveniently accessible when v,it is desired `to use the same,

Serial No. 243,990. (No model.)

When use thereof isto be discontinued, the detent may be thrown out of contact with the detent-wheel by application of the hand to the lever, and the roller may thus be` permitted to be rotated by the action of the spring to wind up the tapes and draw the'ruler up into instance, a spring-arm or an arm or lever'acted upon by a spring-and in such case the springarm or spring acted arm may bear the detent or brake upward against the under side of the detent-wheel, as shown in Fig. 5,a spring-arm, G,being represented in such figure. Said arm may be operated by direct application of the hand thereto, or by means of a cord, G, suspended therefrom, as shown.

The detent devices serve to hold the roller from turning except when the former are disengaged, so that in case the ruler is released while in use it will not change its position, and thus it may be kept in the desired place as long as desired without it being-necessary to exercise any care to prevent it from shifting its position.

I am aware of the employment heretofore of spring-actuated curtain-rollers provided with detent devices adapted to hold'the curtains in any desired position of adjustment. I am aware, also, of the employment heretofore of a weight connected by cords to opposite ends of a ruling device so 'as to tend to raise the latter; but inthis case there are no detent devices for holding the rulingA device from shifting out of the desired position. In my ruling attachment not only do the devices described keep the ruler in true horizontal position, hold it in any desired position while it is desired to there retain it, and when no longer in use raise it out ofthe way, so as to `leave the blackboard free for general use, but, the

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detent being hand-manipulated, the`ru1er may be adjusted to a nieety and with the greatest ease and convenience.

Having' described my invention, I claim The combination, With the ruler, of the tapes, the roller, the spring for rotating tbe said roller to reise the ruler, the detent-wheel, the detent for engagement with Said Wheel to hold the ruler in adjusted position, andthe Vhand-manipulated spring-actuated lever car- Io rying the said detent, substantially as described.

In testimony of which I have hereunto signed my name in the presence of two Witnesses.

SEPHORA LOUISE BETTES. Witnesses:

WM. B. GREELEY, P. D. HASKELL. 

